ICD-11 classes
05 Endocrine, nutritional or metabolic diseases
Nutritional disorders
Overweight, obesity or specific nutrient excesses
Overweight or obesity
5B81 — Obesity

ICD-11 5B81 — Obesity

Obesity is a chronic complex disease defined by excessive adiposity that can impair health. It is in most cases a multifactorial disease due to obesogenic environments, psycho-social factors and genetic variants. In a subgroup of patients, single major etiological factors can be identified (medications, diseases, immobilization, iatrogenic procedures, monogenic disease/genetic syndrome).Body mass index (BMI) is a surrogate marker of adiposity calculated as weight (kg)/height² (m²). The BMI categories for defining obesity vary by age and gender in infants, children and adolescents. For adults, obesity is defined by a BMI greater than or equal to 30.00 kg/m². There are three levels of severity in recognition of different management options.

The diagnosis includes nothing.

The diagnosis excludes nothing.

Diagnosis with code 5B81 contains 6 clarifying diagnoses:

1. 5B81.0 — Obesity due to energy imbalance
   It contains 2 clarifying diagnoses.
2. 5B81.1 — Drug-induced obesity
3. 7A42.0 — Obesity hypoventilation syndrome
4. LD29 — Syndromes with obesity as a major feature
   It contains 1 clarifying diagnosis.
5. 5B81.Y — Other specified obesity
6. 5B81.Z — Obesity, unspecified